For one package of simply mashed potatoes (I use either the garlic or mashed with skins) spray an 8 x8 glass casserole/pan.,In a large skillet cook cabbage & onion in olive oil over medium heat just until tender, seasoning with salt and pepper to taste.,______,Top with remaining potato and cheese.,Bake in a preheated 350 degree oven for 30 minutes or cheese is lightly golden brown.